Slitting and scoring tool



May 27, 1952 RlNTOUL 2,598,649 7' SLITTING AND SCORING TOOL Filed May 18, 1949 Patented May 27, 1952 SLITTING AND SCORING TOOL Peter Rintoul, Toronto, Ontario, Canada, assignor to Canada Illinois Tools Limited, To-

ronto, Ontario, Canada Canada,

a corporation of Application May 18, 1949, Serial No. 93,908

3 Claims.

This invention is concerned with the manufacture of cardboard boxes or cartons and is more specifically concerned with the structure for slitting and scoring a cardboard blank so that it may be folded into a carton, box, tubing, or the like.

Boxes or cartons are generally made from sheet cardboard by cutting acardboard blank to the outside dimensions of the various walls and flaps, slitting the blank between the various fiaps and scoring the blank so that it may be folded readily between the various Walls and between the walls and flaps. To expedite the production of cardboard boxes or cartons, large strips or webs of cardboard are acted upon continuously by slitters and scorers to cut the cardboard blank to the proper lateral dimensions so that it is then necessary only to cut the resulting pieces to the proper length and score them transversely prior to folding them into boxes or cartons. The transverse scoring is of course unnecessary in the manufacture of tubing.

Longitudinal cutting and scoring of the cardboard blank may be readily accomplished by passing a continuously moving strip or web of cardboard between a pair of rotating shafts, one of which carries a number of slitting and scoring heads.

In order to keep the heads sufiiciently sharp and to manufacture boxes of different configurations, it is frequently necessary to remove or interchange the slitting and scoring heads. To the best of my knowledge it has heretofore only been possible to effect such an interchange by removing the shaft or arbor on which the heads are mounted and sliding the heads off axially.

Among the important objects of this invention is the provision of slitter knives and scoring profiles which are removable and replaceable without requiring the removal of the heads from the arbor.

More specifically, it is an object of this invention to provide slitter knives and scoring profiles which are segmented so that they can be removed without sliding them axially off of the arbor.

Another important object of this invention is the provision of a readily releasable means for securing the slitter knives and scoring profiles in position on the various heads on the arbor.

A further and more specific object of this invention is to present a holding wedge for securing the slitter knives and scoring profiles in position on the heads.

Other and further objects and advantages will be apparent from the following description when taken in conjunction with the accompanying drawing in which:

Fig. 1 is a perspective view showing a cardboard blank being operated on by slitter knives and scoring profiles mounted on a rotating arbor;

Fig. 2 is an enlarged sectional view taken along the line 2-2 of Fig. 1 showing a head and an attached slitter knife;

Fig. 3 is a view similar to Fig. 2 taken along the line '33 of Fig. 1 showing a scoring profile in position on a head;

Fig. 4 is an enlarged perspective view of one of the heads carrying a slitter knife; and

Fig. 5 is an enlarged sectional view taken along the line 5-5 in Fig. 1.

Referring now in greater particularity to the drawings, the cardboard blank or web 6 is shown as moving to the right in Fig. 1 above a shaft 8 and below an arbor l 0, both of which are carried by a pair of upright supports l 2 and M. A number of slitter and scoring assemblies [6, I8, 20, 22, 24, 25, 28 of which there may be any desirable number, are carried at spaced intervals by the arbor l0 and act on the web 6.

A slitter assembly is shown in detail in Figs. 2 and 4. A head 30 of arcuate configuration has on its inner circumference a pair of finished bearing surfaces 32 and 34 with a relieved portion 36 between them. This relieved portion does not contact any surface and consequently need not be so highly finished as the bearing surfaces 32 and 34. A key 33 fits in a slot 40 in the inner circumference of the head 30 to secure it to the arbor l0 and is held in the slot by a screw 31 threaded into a bore 39 in the key and fitting loosely in a countersunk bore 4! in the head 30.

' so that there are two slitter halves 48a and 48b cuate holding wedge 3 7 having a flange 58 with its inner wall inclined to cooperate with one of .the recesses 50 or 52 is located adjacent the other side of the slitter 48 to secure it in position. Clearance 60 is left between the retaining ring 56 and slitter 48 so that the inclined wall on r the flange will force the slitter into sea-ted posi-' tion. The end of the head 30 adj'aoent'the' re=1 tainingring 56 has its external diameter threaded as at 62 and a retaining ring 64 is threaded thereon. The retaining ring 64 is provided withv a number of peripheral slots 66 in order that'it; In, order to prevent rotation of the slitter 48 and holding wedge. 56":

relative to the head 30'each of these structures may be screwed into place.

is provided with a transverse slot as 68 and 10 2 respectively on its inner circumference. C- Io;

operating pins and 14 are driven into apertures 16 and 68 in the head to engage the slots 68 and scoring'pro'file assembly is shown in Fig.3.

Thescoring profile 16 itself in this particular embodiment has two arcuate portions I8 and 89 with a valley 82 of lesser diameter'between them. 1 This particular configuration is used as it is 'simpl'erto fold corrugated cardboard or heavy 'pasteboardwhen it is scored in' two closely adjacnt parallel lines than when it is scored, in

onlyrone line and furthermore. this leaves a stronger corner as the strain'due to bending is not so localized. Shoulder portions 84: and 8b may be provided on the scorer profile to bear upon the outer peripheries of the head 30 and holding Wedge 56 and arcuate recesses 88 and 9B 7 7 similar to the recesses 50 and 52 of the slitter 38. are provided between the shoulder portionsBfiv and 86 and the stem portion 92. Atransv'erse slot similar to the slot 63 in the slitter 48 is provided on the inner circumference of the scoringprofile 'lfipfor cooperation with the pin 12 to' prevent rotation between the head. and profile but is net shown in the drawings The remain dr of the assembly is identical with the slitter V "assembly and it is apparent that the only difference between the slitter and scorer assembliesv is in the presenceofthe slitter '48 or scoring profile '16. Some support carried by theshaft Bis needed for the cardboard blank or web 6,

but asthis may be of any desirable form, it

"has been indicated somewhat schematically as a portion of 'ac'ooperati'ng roll 96 in Figs. 2 and'S. 'Any desirable number of. assemblies or heads 5223 may be placedro'n the "arbor l0 and left there "indefinitely. The heads may be secured "at'any desirable location on the arbor and may moved at will by rotating'the screw to re'-' tract the key 38' and then sliding the head to the desired position; 7 If it is desired to replace a dulled slitter '43 or to interchange slitters or scor- Y ngproi ies, it is necessary may to backfofi the retaining ring 64 by unscrewing it, slide the holding wedget's axially along the head 30 and'remove the two halves oftthejslitter or scorin brewery asiinpIe radial movement. -A o verse radial movement places a new slitter or scoring profile in place, anditi then secured by advancing the retaining ring to force the holding wedge. against it withth'e diagonalgwall ofthe flange 5 fitting within one o'f the recesses 50,52, 8 8 or 90 "to force the slitter or scoring the head may be left in position on the arbor Y without a slitter or scoring profile if there are more heads on the arbor than are needed for a particular operation. 7

It is apparent that I have herein presented a slitter and scoring profile construction for operating on a continuously .movingjwebof cardboard or the like to slit and score the cardboard so that it may be formed into cartons, boxes,

tribes or the like. It is further apparent that I have presented such a construction that slitters and scoring profiles maybe readily and quickly removed and replaced without removing the arbor, thus saving considerably in time and eifort over a like operation inthe old type of constructionin which it was necessary'to remove the arbor and slide the heads or slitting and scoring as's'einmies off 'axially'for replacement.

Although I have shown and described a specific embodiment of my invention, it is to be understood that this is for illustrative purposes only-that I intend to be limited only bythe spirit posit'efa'ces thereof; said recesses each having a cam surface, a collar for detachably clamping said tool'section on said head, a cam surface on said collar cooperable with the cam surface'in one of said recesses to seat said tool segmental parts and V secure them in operative position, a plurality. of pins extending radially from said head, said tool section and said collar having aligned radial slots cooperable with said pins to preclude rotation of said tool section and said collar relative to said head, said slots extending only part way into said tool section and said collar from the inner edges thereof, and aretaining ring threadedly mounted :on said head in force said collar into clamping position, said retaining ring havinga plurality of peripheral notches to facilitate :rotaprofileinto said positicn and secure it'th'ere. V

ljheto the arcfiaterecesses on each ring, i1; is possible '09 mount theslittl' Sffolll'lg pl'O- .i is s 'ii ie s wh e- 'rator may desire. It is" further a parent that 2. A rotary tool for slitting or scoring sheet material comprising an annular head adapted to be mounted upon an arbor, a tool section carried by said head "providing aper'ipheral work-'- ing edge, sa segmental in fa section comprising a plurality of ts, said tool section having a recess aid recess having a cam surface, a

"caiia rrb'r 'ieiaehaciy clamping said tool section orij's'aid head, a cam surface on said collar cooperatie with surface in said recess to seat said tool segmental parts and to clamp them in 'oiaeiativ position, a plurality of pinsjextendlng radially'out'ward from said mean, one of Said tool segmental parts having a radial slot, said collar having a radial slot, said slots extending radially only 'partiallyinto said part and said collar from 'tlie inner edge thereof and extending axially 'cempletely 'tlie'retlirou'gh' and fitting over said i pins to preclude rotation of said tool segmental parts and said collar relative to said head, and a owing movementor said pa'rts transverse relative thereto diiring seating, and a retainer 'on said head for retaining said collar in clamping pes'itio n' against said tool section.

3.:Al0l'Ya-TY1Z001 for slittingand scoring sheet niaterial'assetforth in claim -1, wherein the outer periphery of said tool section is asymmetrical in ""eross'section with the peripheral working, edge REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Cowan Nov. 30, 1915 Number Number Number Name Date Schank Mar. 28, 1922 Hurd Feb. 3, 1925 Gannon et a1. June 7, 1932 Stacey Apr. 2, 1935 Carr July 28, 1936 Ungar Mar. 4, 1941 Staude Oct. 18, 1949 FOREIGN PATENTS Country Date Great Britain May 17, 1912 

